Repair/Maint Of 33/11 Kv Mrs Yard , Power Transformers , Ht Vcb Panels , Distribution Transformers , Ht Rmus , Ht Ug Cables Including Servicing And Calibration Of Relays At Dolphin Hills And Other Allied Areas Under Age E/M No I Of Ge ( U-I ) , Visakhapatnam , M & L For Disconnecting Carefully Electrical Connection From Both Ht/Lt ( Primary & Secondary ) Sides Of The Transformer , Keeping Them At Safe Side , Draining The Transformer Oil To 3/4Th Level In Clean Container For Re-Use , Opening Top Cover Of The Transformer By Unscrewing Nuts , Bolts , Washers Etc , Thorough Inspection Of Bushings , Windings , Providing Insulations To Leads And Terminals , Refixing The Top Cover Incl Replacement Of Corck Sheet/ Gasket 8Mm Thick , Tightening Of Nuts /Bolts /Washers Etc And Replacement Of Breather With Silica Gel Crystal Type , Replacement Of Defective Bushing Rods/Bushes/ O Rings ( Oil Seals ) , Refilling The Transformer Oil , Improving Insulation Values By Dehydration Of Transformer Oil Of Transformers To Achieve Di-Electric Strength Not Less Than 60 Kv At 2 . 5Mm Gap As Per Relevant Is With Suitable Portable Filtration Plant , Connecting Ht/Lt Cables , Testing & Commissioning Complete Of Following Capacity Transformers :- , 2500 Kva / 3150 Kva , 33Kv / 11 Kv , Step Down , 5000 Kva , 33Kv / 11 Kv , Step Down , Note: ( A ) The Inspection Of Transformer Shall Involve:-I ) Checking Of All Clamps , Nuts , Bolts Including Core Bolts & Cover Fixing Bolts . Ii ) Checking All Brazings , Joints , Tap Heads And Connection Joints . Iii ) Checking All Jumpers , Terminations/ Connections Inside The Transformer . Iv ) Checking The Buckholz Relay , Conservator Mog . V ) Arresting Leakages Of Radiator Assembly By Brazing . Vi ) Arresting Wetting At Interconnections By Replacements Of O Rings Etc Complete . Vii ) Painting Of Transformer Complete With Two Coats Of Synthetic Enamel Paint Externally Complete All As Directed By Engr-In-Charge . Viii ) Conducting The Tests On Core And Windings As Per Is Like Ratio , Magentic Imbalance , Short Circuit Etc In Presence Of Engr-In-Charge And Test Results Shall Be Signed Both By The Contractor And Engineer -In-Charge And Kept On Record . , ( B ) Any Damage To Insulators/Bushes/Windings Etc While In The Custody Of The Contractor Shall Be Made Good At No Extra Cost To Govt . The Serviceability Of The Transformer Shall Be Checked And Confirmed By The Contractor Before Taking Into His Custody . ( C ) The M/L For Bushes , Studs , Transformer Oil , Filtration Of Oil , Cable Box , Replacement Of Major Spares , Repair/Servicing Of Oltc Etc Will Be Measured And Paid Separately . , M&L For Overhauling Of Oltc Of 33/11 Kv Transformer Of Following Capacity By Draining Out Of Transformer Oil Of Oltc , Dismantling Of Top Cover , Inspection Of Moving And Fixed Contacts Of All Three Phases And Checking The Operation , Cleaning And Removal Of Contacts Of All The Three Phases And Checking The Operation , Cleaning And Removal Of All Carbon Particles , Cleaning Of Contacts With Emery Paper , Checking The Tightness Of Leads In The Oltc Board , And Moving/Fixed Contacts . Inspection Of Transition Resistance And Replacement Of Gaskets / Contacts Etc If Found Damaged , Reassembling Complete , Filling Up Of Oil , Testing And Commissioning Complete All As Directed By Engr-In-Charge . , A ) 2500 Kva / 3150/5000 Kva , 33Kv / 11 Kv , Step Down , M&L For Replacement Of Radiator Drain Valves For 2500/3150/5000 Kva 33/11 Kv Transformers Including Dismantling Old One . , M&L For Replacement Of The Ht Porcelain Bushings Complete Of Following Capacity Transformers Of Any Make/Size/Type All As Directed Including Dismantling Old One . , ( A ) 2500/3150 Kva , 33/11 Kv , ( B ) 5000 Kva , 33/11 Kv , M&L For Replacement Of The Ht Bushing Rod Made Out Of Gun Metal With Threading & Suitable Length/Size All As Per Existing Including Metal Rings/Bolts/Washers/Rubber Rings Etc Complete Of Following Capacity Transformers Of Any Make/Size/Type All As Directed Including Dismantling Old One . , ( A ) 2500/3150 Kva , 33/11 Kv , ( B ) 5000 Kva , 33/11 Kv , M/L For Replacement Of Winding Temperature Indicator ( Wti ) Of 33/11 Kv Transformers Of Capacity 2500 To 5000 Kva Including Dismantling Old One . , M/L For Replacement Of Oil Temperature Indicator ( Oti ) Of 33/11 Kv Transformers Of Capacity 2500 To 5000 Kva Including Dismantling Old One . , M&L For Disconnecting Carefully Electrical Connection From Both Ht/ Lt ( Primary & Secondary ) Sides Of The Transformer , Keeping Them At Safe Side And Taking Out The The Transformer Indoor/ Outdoor Type Of Capacity From 63 Kva To 750 Kva , 11 Kv/ 0 . 433 Kv , Step Down Any Make For Carrying Out Refixing After Completion Of Minor Repairs Like Maintenance / Replacement Of Ht/Lt Bush , Metal Rods , Lugs , Replacement Of Rusted Nutbolts Etc Including Cheking The Continuty Of Ht/Lt Windings , Top Cover Opening , Prevent The All Oil Leakages , Provn Of New Insulated Gaskets / Cork Sheet For Ht/Lt Supply Etc Complete All As Specefied And Directed . Note: Porcelain Bushings , Gun Metal Rods , Cable End Joint Kit , Transformer Oil Etc To Be Measured And Paid Separatly Under Respective Schedules . , M&L For Disconnecting Carefully Electrical Connection From Both Ht/ Lt ( Primary & Secondary ) Sides Of The Transformer , Keeping Them At Safe Side And Taking Out The Transformer Indoor/ Outdoor Type Of Capacity From 401 Kva To 750 Kva , 11 Kv/ 0 . 433 Kv , Step Down Any Make For Carrying Out Complete Overhauling Which Shall Comprise Of The Following Includinguding Handling , Lifting , Transportation To And From Complete :- , A ) Opening Top Cover Of The Transformer By Unscrewing Nuts , Bolts , Washers Etc . Including Disconnecting Core Assembly From Ht/ Lt Bushing And Lifting The Same Gently And Taking Out From The Shell ( Container/ Body ) Of The Transformer . , B ) M&L For Draining Out Transformer Oil From The Above Said Transformer In The Suitable Capacity Of Container /Drums And Keeping It In Safe Custody For Reuse . , C ) M&L For Cleaning The Transformer Body From Inside , Removing Deposited Dirt/ Sludge/ Foreign Particles Etc . From The Bottom/ Body Of The Transformer And Drying Up The Shell From Inside Before Refilling Of The Transformer Oil . , D ) M&L For Cleaning And Washing Thoroughly Core And Windings Of The Transformer By Hosing Down With Clean Dry Oil , Removing Deposited Dirt/Sludge/Foreign Particles From The Windings/ Core , Thorough Inspection Of Windings , Providing Insulations To Leads And Terminals , Heating/ Drying/ Baking Complete Carefully And Thoroughly Inside The Heating Chamber At Suitable Temperature To Obtain Required Value Of Insulation Resistance Etc . All As Directed By Engr-In- Charge . , E ) Lifting And Refixing Core Assembly Inside The Transformer Shell Gently And Carefully , Connecting Primary/ Secondary/ Neutral Connections To The Bushings Assembly , Fixing Of Tap Change Over Including Tightening Of Nuts , Bolts , Washers Of The Core To Reduce Humming Noise All As Directed . , F ) Refilling The Filtered Transformer Oil In The Shell Of Transformer Complete . , G ) Refixing The Top Cover Including Replacement Of Cork Sheet/ Gasket , Tightening Of Nuts/ Bolts/ Washers Etc . And Replacement Of Breather With Silica Gel Crystal Type All As Directed By Engr-In Charge , H ) Lifting/ Handling From Where Removed And Re-Installing The Transformer Including Connecting Primary/ Secondary/ Neutral Connections Etc . All As Directed By Engr-In-Charge . , Note: ( I ) Any Damage To Insulators/ Bushes/ Windings Etc . While In The Custody Of The Contractor Shall Be Made Good At No Extra Cost To Department . The Serviceability Of The Transformer Shall Be Checked And Confirmed By The Contractor Befor
